CVE-2017-5963: An issue was discovered in caddy (for TYPO3) before 7.2.10

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MEDIUM 6.1DOWNGRADE

CVE-2017-5963 is a medium-severity flaw (CVSS 6.1) affecting caddy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in caddy (for TYPO3) before 7.2.10. The vulnerability exists due to insufficient filtration of user-supplied data in the "paymillToken" HTTP POST parameter passed to the "caddy/Resources/Public/JavaScript/e-payment/paymill/api/php/payment.php" URL. An attacker could execute arbitrary HTML and script code in a browser in the context of the vulnerable website.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-79
Published	2017-02-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: caddy project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2017-02-12 04:59 UTCPublished CVE record published
2026-06-17 01:21 UTCUpdated Record last modified

caddy project caddy DOWNGRADE

Affected: 2.1.4 alpha · 2.1.5 alpha · 2.1.6 alpha · 3.0.0 alpha · 4.0.0 alpha · 4.0.1 alpha · 4.0.2 alpha · 4.0.3 alpha

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1.4

1. Check installed version

apt-cache policy caddy || rpm -q caddy || caddy --version

2. No fixed release: DOWNGRADE to a release before 2.1.4 (Debian / Ubuntu)

apt-cache madison caddy sudo apt install caddy=<VERSION_BEFORE_2.1.4> sudo apt-mark hold caddy

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list caddy sudo dnf downgrade caddy-<VERSION_BEFORE_2.1.4> sudo dnf versionlock add caddy

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-5963?

caddy: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-5963 being exploited?

CVE-2017-5963 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-5963 affect?

CVE-2017-5963 affects caddy. Severity is medium (CVSS 6.1). An issue was discovered in caddy (for TYPO3) before 7.2.10. The vulnerability exists due to insufficient filtration of user-supplied data in the "paymillToken" HTTP POST parameter passed to the "caddy/Resources/Public/JavaScript/e-payment/p

How urgent is CVE-2017-5963?

Priority 42/100. Public exploit reference

Software pages

PHP vulnerabilities · TYPO3 vulnerabilities · Caddy vulnerabilities

Related CVEs

CVE-2026-45135 HIGH 8.1 UPGRADE Caddy is an extensible server platform that uses TLS by default
CVE-2026-52844 HIGH 7.5 UPGRADE Caddy is an extensible server platform that uses TLS by default
CVE-2026-52845 HIGH 8.1 UPGRADE Caddy is an extensible server platform that uses TLS by default
CVE-2026-45692 MEDIUM 5.4 UPGRADE Caddy is an extensible server platform that uses TLS by default
CVE-2026-52846 MEDIUM 4.2 UPGRADE Caddy is an extensible server platform that uses TLS by default

References

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